Thus apart from the physical and psychological ill-effects of going to sleep late at night, at a spiritual level too going to sleep late at night is detrimental. Also when we go to sleep late at night we invariably end up getting up late in the morning. As explained above the subtle basic Sattva component is at its highest in the hours just before sunrise and the hours just after it. Hence by not working in the early morning hours we lose the benefit of the enhanced sattvikta at that time. Thus from the perspective of getting maximum value for the time we put in, it is best not to go to sleep late at night.